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In a stable ecosystem, which of the following limits the number of trophic levels?
In a stable ecosystem, availability of nutrients, limits the number of trophic levels.
Most of the world's carbon is found:
Factual
Photosynthesis and respiration are central to which cycle?
Cellular respiration and photosynthesis are important parts of the carbon cycle. The carbon cycle is the pathways through which carbon is recycled in the biosphere. While cellular respiration releases carbon dioxide into the environment, photosynthesis pulls carbon dioxide out of the atmosphere.
Which of the following changes would not result in an increase in net primary production?
Primary production is not increased with increasing latitude .
Grasslands can support greater grazing rates by herbivores than forests because:
Most grassland plants are herbaceous. This means they are green and leafy and have little or no woody tissue. Also, they have shoots that emerge from beneath the ground.
An ecosystem, which can be easily damaged, but can recover after some time if damaging effect stops will be having:
Stability is the power of a system to be in their state against unfavourable factor. Resilience is the capability of regaining its original shape or position after being deformed. Hence, it has low stability and high resilience.
Perturbation of which of the following cycles contributes most to global warming?
Changes in Global Carbon cycle contributes most in global warming.
Some of the stages in the hydrarch are labelled as:
A. Marsh meadow stage
B. Reed swamp stage
C. Submerged plant stage
D. Phytoplankton stage
E. Submerged free floating plant stage
Identify the choice that represents the correct sequence of these stages:
XII NCERT, ECOSYSTEM
PAGE NO 252
Figure 14.5
Animals with a constant body temperature such as mammals and birds require more food than do animals with a changing body temperature such as reptiles and fish. Why?
Mammals and birds require much more food and energy than do cold-blooded animals of the same weight. This is because in warm-blooded animals, the heat loss from their bodies is proportional to the surface area of their bodies, while the heat created by their bodies is proportional to their mass.
Ecological niche is:
Ecological Niche physical position and functional role of a species within the community
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